Physics Ch. 28
Physics, Chapter 28-Reflection and Refraction
Terms in this set (25)
What is reflection?
the return of light rays from a surface
What is refraction?
the bending of an oblique ray of light when it passes from one transparent medium to another
When a piece of regular paper is illuminated by white light, the paper appears white. What does this reveal about the electrons?
That the electrons re-emit all the visible frequencies; very little absorption occurs.
What is Fermat's principle of least time?
Light takes the path that requires the least time when it goes from one place to another.
What is the law of reflection?
The angle of incidence equals the angle of reflection.
What is diffuse reflection?
Reflection in irregular directions from an irregular surface
What is the critical angle?
The minimum angle of incidence inside a medium at which a light ray is totally reflected.
What is total internal reflection?
The total reflection of light traveling within a denser medium when it strikes the boundary with a less dense medium at an angle greater than the critical angle.
What is a converging lens?
A lens that is thicker in the middle than at the edges and that refracts parallel rays to a focus.
What is a diverging lens?
A lens that is thinner in the middle than at the edges, causing parallel rays to diverge as if from a point.
What is a virtual image?
An image formed by light rays that do not converge at the location of the image.
What is a real image?
An image formed by light rays that converge at the location of the image. A real image, unlike a virtual image, can be displayed on a screen.
What is aberration?
Distortion in an image produced by a lens, which to some degree is present in all optical systems.
What evidence can you cite to support the claim that the frequency of light does not change upon reflection?
The color of an image is identical to the color of the object forming the image. When you look at yourself in a mirror, the color of your eyes doesn't change. The fact that the color is the same is evidence that the frequency of light doesn't change upon reflection.
If you wish to take a picture of your image while standing 5 m in front of a plane mirror, for what distance should you set your camera to provide the sharpest focus?
Set your camera for 10 m; the situation is equivalent to standing 5 m in front of an open window and viewing you twin standing 5 m beyond the window.
Distinguish between reflection and refraction.
When light is returned into the medium from which it came, we call it reflection, while refraction is when light crosses from one transparent material into another.
How does incident light that falls on an object affect the motion of electrons in the atoms of the object?
The electrons vibrate more energetically in response to the oscillating electric fields of the light.
What do the electrons affected by illumination do when they are made to vibrate with greater energy?
They re-emit the light that falls on them.
What is Fermat's principle of least time?
Light will always travel the path from one point to another that requires the shortest amount of time.
Relative to the distance of an object in front of a plane mirror, how far behind the mirror is the image?
The image is as far behind the mirror as the object is in front of the mirror.
What fraction of the light shining straight at a piece of clear glass is reflected from the first surface?
only about 4%
Can a surface be polished for some waves and not others?
Yes; a surface may be polished for radiation of a long wavelength but not polished for light of a short wavelength.
How does the angle at which a ray of light strikes a plane of window glass compare with the angle at which it passes out the other side?
The angles are the same.
Is a mirage the result of reflection or refraction?
What is the relationship between refraction and changes in the speed of light in a material?
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